Yeah, connectors out the side almost always signals non-Q-bus. This is part of the set that runs (surprise!) a Versatec plotter - think of it as a really labor-intensive laserprinter and you won't be too far off. I think this is a MSCP MFM disk controller (there was also a floppy-only version.) The WQESD is the same as the SCD-RQD11/EC is the same as the Qualogy equivalent is the same as the DSD equivalent is the same as the American Digital Equivalent... *All* designed by Webster out of Australia. Count the chips, identify their type, and you know the size! -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology WWW: http://www.trailing-edge.com/ 7328 Bradley Blvd Voice: 301-767-5917 Bethesda, MD, USA 20817 Fax: 301-767-5927